body {
  background: #333;
  color: #fff;
  font: 300 100.1% "Helvetica Neue", Helvetica, "Arial Unicode MS", Arial, sans-serif;
}
#button-holder{
  float:left;
}

#holder {
  border: solid 1px #000;
  float:left;
  height: 480px;
  width: 640px;
}